This summer, Hollywood reaches back to tap into our affections for comics, novels, old TV shows, nearly forgotten films and more. For some fans, that's reason to cheer. Here's a selection of readers' fondest memories, along with some film history and the latest on the new installments.

"Nature, red in tooth and claw," wrote the poet Alfred Lord Tennyson. Mourning the death of a friend, he also penned a catchphrase for ecologists, who see his poetry in action. One natural laboratory in which tooth and claw play out their drama is the American West, where studies of wolves and elk are a cottage industry.